I do not have to wear a respirator, but some guys where I work do. It depends on your company's policy. In our case, we have to be shaved at the sealing area where the respirator contacts the skin. Some of these guys do wear a solo mustache, but I do not know of any with a large mustache style.

Most go around the bottom of the chin to above the nose, and the mustaches area, as well as soul patch for most, is not in the contact area. if you had a handlebar, you would have to push the bars down, inside the respirator.

My Beard Journey:  http://jefffsbeardboard.yuku.com/topic/25137/Finally-I-have-a-Beard
Beard and Bald Thread:  http://jefffsbeardboard.yuku.com/topic/27831/Beard-bald-head-shaved-head-or-buzzcut
Patchy Beard Success Stories:  http://jefffsbeardboard.yuku.com/topic/33742/Patchy-Beard-success-stories-Before-and-After-photos#.ViujbH7nuM8
Taming the Wild Mustache:  http://jefffsbeardboard.yuku.com/topic/30822/Taming-the-Wild-Stache#.Vj_Mh7erTIU
  
Last Edited By: Slybeard Mar 25 16 5:45 PM. Edited 1 times.